Jetson Nano doesn't enter in bootloader

Please help me with ideas what can prevent Jetson enter in bootloader from carrier board?
We have our own design of carier board and on it clear Jetson sends some information via uart 2. After we deploy linux to Jetson, it stops sending anything. Jetson module is working , because it works on the Nvidia motherboard.
Thanks for any ideas.

What do you mean “deploy linux to jetson”? Then what was that when you didn’t “deploy linux to jetson”?

I meant jetpack ) Thanks for reaction! but i’ve found the problem. It was eeprom on our carrier board that was connected to i2c0. After unsoldering - Jetson begin works!

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